Underfeed stoker.



w. 1. KENNEY.v

UNDEHF'EED sTo'KER. APPLICATION FILED CT|0,19|4

Patented Jan. 9, 191?.

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entre "n ,i Kennelijk@ attrici@ 'WIIIJLIAMy J. KENNEY, 0F VLMETTE, LLl'NGIS, SSGHOR T() UNEER-FEED STGR COMPANY( OF AMERECA, 0F GHCAGC, LJNOS, A CCRPORATII @El NEW' JEF-,SEER

UNDERFEED STOKERh Application filed etober 10, 19M.

17 70 @ZZ whom 'it may concern? Be it known that L illumini J. KENNEY, a citizen of' the United States, residing at Vilniette, county oli Cook, and State ot illinois, ha ve invented a certain nenl and useful Improvement in Underfeed Stokers, and declare the following to be a full, clear, and exact description of the saine, snch as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanyingl drawings, which form a part of this specii'ication.

In burning high grade cokingl coals in self-cleaning undei'feed stokers ot' the J ones typeA diliiculty is sonietin es experienced because of peculiar conditions which arise. Coal of this kind gives off its gases at a low temperature and the resulting coke is Very hard and strong structurally. ln the J ones Stoker, the coal is fed forwardly and upwardly in a retort having twyerblocks around the top, the coal being coke' is it rises and burning' in the vicinity the The colte formed in `the retwyer blocks.

lelds to the torts from ordinary coal. read'1 pressure tending to force it i pwardly and rearwardly and is broken np. ln the case of high grade coking' coal, tne coke which is formed in the retort becomes a strong solid mass which fails to break up, thus preventing the air from the twyer blocks from being effectively distributed throughout the inass to be consumed, and resulting in the formation of blow holes in the lire. The various forces acting on the coke, such as the pressure of theinconiing coal, gran/it;`r` action due to the downward inclination the top of the retort, and the mechanism at the of the retort whose function is to the clinkers and ashes to the discliargu move the solid mass of coke rearwardiy, because of the resistance encountered hy 'the coke in such rearward movement, constantly increasing the closeness or its texture and its depth or thickness. The result is that eoinbastion takes place even less readily and less effectively at the rear end of the retort than at the front end. The diliiculties encountered are of course entirely due to the solid ity of the coke and therefore, bybreaking up the solid masses of coke, all advantages resulting from the use of the tiones type of Stoker under the most favorable conditions of use are obtained with burning high grade coking coals.

Specification of Letters atent.

Patented J 29 Serial No. 866,028.

The object of my invention is to prot-*ide a siinple and e'lliective means for autoniati cally breaking' up coke 'oli any degree hardness and strength wh may be torinesi in the undert'eed stol-ters he Jones :rv or any othenA type enibor 7'ng retorts troughs into which` the coal fed.

The various features of ovelty where my invention is characterised will herei after be pointed ont with particularity in the claims; but lor a full understamlin3` of my invention and of its object and advai.-

the pusher rod in the bottoni ot is indicated a' trot the top of retort twyer blocks, e, ln the usual rangement., the inner faces ot' the twyer blocks are i'nade continuations of the inner :faces of the side walls ci' the retort. 'tn ao cordance with my invention, l construct the. twyer blocks so that they proie-.ct inwar beyond the inner surfaces of "il oi' the retort. ln other words, between twyer blocks on the of the retort is less than t oi the togy oi the retort at the sa Furthermore, the 'inner faces ci th' blocks are so shaped that row oi' the blocks on one side of the retort, `Jiewed in. plan, has the appearance. of being provided ratchet teeth onits inner edge', transverse shoulders of the teeth facing; forwardly. the arrangement shown, each block, Viewed in plan, ecoines narrower from the front end to the middle where it increases again in width so as to torni a shoulder, 5, an l. then decreases again as the rear end is approached. Since the rear end of one block` is narrower than the front end of the block just behind it, this leaves the iront end ci the latter block projecting so as to torni a lli shoulder similar to the shoulder, 5. Each block is also made shallower in the vertical direction at the rear end than at the front end so that a row of blocks in side elevation presents a broad edge made of long ratchet teeth Whose abrupt faces face forwardly. The effect ot this peculiar twyer block construction just described is as follows: The coking of the coal takes place in a Zone below the twyer blocks and, as the coke is lifted and moved laiclnvard by the incoming coal beneath it, any solid `mass which extends across the retort encounters a narrow passage as it engages with the twyer blocks in its upward movement and is subjected to transverse crushing stresses which break it up ment between the twyer blocks on opposite sides ot the retort brings into play a diii'eront set of crushing stresses which 'further aid in breaking up the mass. W'hatever reaches the top ot' the twyer blocks and overflows thereon is subjected to crushing or tearing stresses, il it takes the iorm oi' 'a considerable mass, as the cleaning i'nechanism at the sides o'l.l the retort moves it toward the rear, over the irregular surface presented along the top of the twyer blocks. lonsequently, any large body oi' coke that may be formed will be ell'eetiveiy broken up, so that the air will be distributed eil'ectively by twyer blocks throughout the entire body ot' combustible material lying in the combus-v tion Zone7 and the stoker will operate eili ciently and at the full capacity regardless Of .the nature of the coall which is being burned. Y

Since the presuit invention does not de,-

At the same time the reamy'ard movcnausea pend upon any particular kind of self-cleaning mechanism, I have not illustrated any self-cleaning mechanism, but direct attention to my prior application tiled May 24, 1912-3, Serial No. 769564 `for illustration of mechanism ot this kind.

lVhile I have illustrated and described in detail only a, single preferred form of my invention, I do not desire to be limited to the structural details thus illustrated and described; but intend to cover all forms and arrangements which come within the terms employed in the vdefinition ot my invention constituting the appended claims.

l' claiml. VIn combii-iation, a retort open at the top and at one end and adapted to receive luel through the open end, twyer. blocks arranged about the top oi the retort, the twyer blocks being shaped to produce a serrated inner edge containing a series ot shoulders l'aeing said open end.

2. The, combination with the retort of an umlei--tee l stoher` ot' twyer blocks arranged about the top of the retort, the twyer blocks being shaped to produce a serrated inner edge at the top ot the retort, and the twyer blocks projecting inwardly from the upper. edges oi the retort and having their projecting under edges shaped to present a serrated line.

ln testimony whereof, sign this specilication in they presence ot two witnesses.

Ywi maat/i J. KENN er.

. j lVitnesses: U

li/laaoann'r FALAU im, il. (l. 'clamor'. 

